CN102016246B - Construction machine - Google Patents

Abstract

The upstream cylindrical body (21) and the downstream cylindrical body (24) are fixedly installed on the support member (19), and the filter cylindrical body (26) is installed between each cylindrical body (21), (24) and arranged as Can be disassembled. As a result, only the filter cartridge (26) can be detached while the respective cartridges (21), (24) remain on the support member (19), and the particulate matter removal filter (28) can be easily removed. ) maintenance work. In addition, each pressure conduit (32), (33) and pressure sensor (34) of the pressure detection device (31) for detecting the clogging state of the particulate matter removal filter (28) are arranged at a distance from the filter cylinder body ( 26) The location of the moving route (30). Accordingly, only the filter cartridge (26) can be easily attached and detached without interfering with the pressure conduits (32), (33) and the pressure sensor (34).

Description

Construction machinery

technical field

The present invention relates to a construction machine such as a hydraulic excavator, and particularly to a construction machine equipped with an exhaust gas purification device for purifying exhaust gas from an engine.

Background technique

Generally, a hydraulic excavator, which is a representative example of a construction machine, includes a self-propelled lower traveling body, an upper swinging body mounted so as to be able to swing on the lower traveling body, and a tilting structure on the front side of the upper swinging body. The operating device set in the way of action. In addition, on the upper revolving body, an engine for driving a hydraulic pump is installed at the rear of the revolving frame, and an exhaust gas purification device for removing harmful substances in the exhaust gas is installed on the exhaust pipe of the engine.

In addition, as an exhaust gas purification device installed in a hydraulic excavator, there is known a particulate matter removal filter (usually called: Diesel Particulate Filter, Abbreviated as DPF) (Patent Document 1: Japanese Patent Application Laid-Open No. 2003-120277).

The exhaust gas purification device of this patent document 1 includes, for example, connected in series: an upstream cylindrical body connected to the exhaust pipe; a downstream cylindrical body arranged on the downstream side of the upstream cylindrical body to discharge exhaust gas; A filter cartridge with a particulate matter removal filter built in between the cartridge and the downstream cartridge. In addition, the exhaust gas purification device is attached so that the filter cylinder is fixed on the engine side, and the upstream cylinder and the downstream cylinder can be attached and detached from the filter cylinder. In addition, the particulate matter removal filter built into the filter cartridge traps particulate matter in exhaust gas, and when a predetermined amount of particulate matter is captured, the accumulated particulate matter is removed by combustion.

Therefore, the exhaust gas purification device is provided with a pressure conduit connected upstream and downstream of the particulate matter removal filter therebetween, and a pressure sensor for detecting the upstream pressure and downstream pressure taken out from the respective pressure conduits. Thus, in the exhaust gas purifying device, the amount of particulate matter collected (clogged state) of the particulate matter removing filter is detected based on the pressure difference between the upstream side pressure and the downstream side pressure (Patent Document 2: Japanese Patent Laid-Open No. 2005- Bulletin No. 120839).

On the other hand, the particulate matter removal filter removes the particulate matter by burning, but the ash components after burning gradually accumulate. Therefore, in the exhaust gas purification device of Patent Document 1, in order to clean the ash components accumulated in the particulate matter removal filter, the upstream cylinder body and the downstream cylinder body are mounted in a built-in particulate matter removal filter so that they can be attached and detached. on the filter cartridge of the filter.

However, according to Patent Document 1, a filter cartridge incorporating a particulate matter removing filter is fixedly attached to an engine. So where is the cleaning? ? In the case of particulate matter removal of the ash component in the filter, the filter cartridge must be removed from the engine along with the upstream and downstream Remove from cylinder. Therefore, there is a problem that a lot of man-hours are required to clean the particulate matter removing filter.

In addition, in order to treat the exhaust gas at a high temperature, the exhaust gas purification device is generally arranged near the engine. However, in the case of a hydraulic excavator, a plurality of devices and components such as a counterweight, an oil tank, a hydraulic pump, hydraulic piping, and a firewall separating the engine and the hydraulic pump are disposed around the engine. Therefore, a counterweight, a fuel tank, an engine, a firewall, and the like are disposed around and below the exhaust gas purification device.

Therefore, the filter cartridge of the exhaust gas cleaning device is removed by moving upwards and installed by moving downwards after maintenance. In addition, considering workability such as piping connection work and maintenance work, the pressure sensor and each pressure pipe are generally installed on the upper side of the exhaust gas purification device so that they are easily accessible by hand.

However, when the pressure sensor and each pressure conduit are attached to the upper side of the exhaust gas purification device, the pressure sensor and each pressure conduit interfere when the exhaust gas purification device is attached and detached in the vertical direction. Therefore, these pressure sensors, pressure conduits, and the like must be removed in advance before removing the filter cartridge, and there is a problem that the workability of cleaning the particulate matter removing filter is significantly reduced.

Contents of the invention

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a pressure sensor and a pressure conduit that can be installed in the vicinity of the exhaust gas purification device without moving the upstream cylinder and the downstream cylinder. A construction machine that can easily perform maintenance work on the filter inside the filter cylinder by simply attaching and detaching the filter cylinder.

(1). The construction machine of the present invention is equipped with: a vehicle body capable of self-propelled movement, an engine mounted on the vehicle body, a hydraulic pump installed on one side of the engine in the longitudinal direction, connected to the above-mentioned engine through an exhaust pipe, and purified An exhaust gas purification device for exhaust gas, the exhaust gas purification device includes: an upstream cylinder connected to the exhaust pipe; a downstream cylinder arranged to be closer to the downstream side than the upstream cylinder and discharge exhaust gas; Between the cylinders, there is a built-in filter cylinder for trapping particulate matter contained in exhaust gas; an upstream side pressure conduit installed on the above-mentioned upstream cylinder to guide the pressure in the above-mentioned upstream cylinder to the outside; A downstream side pressure conduit installed on the downstream cylinder to guide the pressure in the downstream cylinder to the outside; and a pressure sensor connected to these conduits to detect the pressure before and after the filter.

In addition, in order to solve the above-mentioned problems, the structure adopted in the present invention is characterized in that the above-mentioned upstream cylindrical body and the downstream cylindrical body are arranged to be fixed relative to the above-mentioned vehicle body side, and the above-mentioned filter cylindrical body is arranged to be able to move relative to the above-mentioned upstream cylindrical body. Mounting and dismounting with the downstream cylinder body, the above-mentioned upstream side pressure conduit, downstream side pressure conduit, and pressure sensor are arranged at positions deviated from the movement route that is used to carry out the maintenance work of the above-mentioned filter cylinder. The body is unloaded from the above-mentioned upstream cylinder and downstream cylinder and moved to other positions, and the moving route when returning from other positions and installing.

With such a structure, the filter cartridge can be attached to and detached from the upstream cylinder and the downstream cylinder fixed on the vehicle body side, so only the upstream cylinder and the downstream cylinder can be detached while leaving the upstream cylinder and the downstream cylinder on the vehicle body Filter cartridge. Thereby, the detached filter cylinder can be easily moved to another position, and maintenance work of the filter, such as inspection work, cleaning work, repair work, etc., can be easily performed at this position.

In addition, the filter cylinder needs to be moved when performing filter maintenance work. However, in this case, the upstream side pressure conduit, the downstream side pressure conduit, and the pressure sensor are arranged at positions deviated from the moving route of the passage when the filter cartridge is moved. Therefore, even when installing and removing the filter cartridge for maintenance work, the upstream side pressure pipe, downstream side pressure pipe and pressure sensor will not interfere, so there is no need to remove these parts.

As a result, even when the exhaust gas purification device is accommodated in a narrow space, only the filter cylinder can be easily attached and detached from the upstream cylinder and the downstream cylinder, thereby enabling easy built-in filtration. maintenance work on the filter in the tank. In addition, if the upstream side pressure conduit, downstream side pressure conduit, and pressure sensor are located away from the moving path of the filter cylinder, they can be arranged in a position that is easy to visually observe and can be touched by hand, thereby improving assembly work and maintenance. Workability, etc.

(2). In this case, according to the present invention, the above-mentioned vehicle body is provided with an engine-side space formed on the above-mentioned engine side and a pump-side space formed on the above-mentioned hydraulic pump side to prevent working oil from flowing from the pump side. The exhaust gas purifying device is disposed in the engine-side space partitioned by the partition member, and the moving path for moving the filter cartridge is formed between the partition member and the engine.

With this configuration, the partition member can prevent, for example, working oil leaked from the pump side space from being scattered into the high-temperature engine side space, thereby improving safety, reliability, and the like. Furthermore, even in the case where the partition member is provided, a moving route for moving the filter cartridge can be formed between the partition member and the engine. Thereby, the filter cartridge can be moved to another position for maintenance work through the above-mentioned moving route, and can also be returned from the other position.

(3) In addition, according to the present invention, the above-mentioned partition member is elongated in the vertical direction, and the above-mentioned movement for moving the filter cylinder is formed by the space in the vertical direction between the above-mentioned partition member and the engine. route.

With this configuration, the space in the vertical direction between the partition member and the engine can be used as a movement route for moving the filter cartridge. Thereby, even if it is a narrow space between the partition member and the engine, the filter cartridge can be removed from between the upstream cylinder and the downstream cylinder by moving the filter cylinder upward on the moving path. On the other hand, the filter cartridge can be installed between the upstream and downstream cartridges by moving it downwards.

(4) According to the present invention, the engine is provided with a supporting member on which the exhaust gas purifying device is mounted, and the upstream cylindrical body and In the downstream cylinder, the pressure sensor is mounted on the support member at a position deviated from the moving path of the filter cylinder.

Accordingly, if the support member is provided on the engine, the upstream cylinder and the downstream cylinder of the exhaust gas purification device can be fixedly attached to the support member while ensuring the insertion space of the filter cylinder. In addition, since the pressure sensor is attached to the supporting member, the pressure sensor can be arranged in the same vibration system as each cylinder, and the life of each conduit connecting the pressure sensor and each cylinder can be extended.

(5). According to the present invention, the pressure sensor is mounted on either one of the upstream cylinder or the downstream cylinder at a position deviated from the moving route of the filter cylinder. Thus, by mounting the pressure sensor using either the upstream cylinder or the downstream cylinder, it is not necessary to newly add a large bracket or a bracket with a complicated shape, and the pressure sensor can be mounted with a simple structure.

(6). In addition, according to the present invention, the above-mentioned upstream side pressure conduit and the downstream side pressure conduit are located at positions deviated from the moving route of the above-mentioned filter cylinder, along the outer peripheral sides of the above-mentioned upstream cylinder, filter cylinder, and downstream cylinder. set up. Accordingly, when the filter cartridge is moved, the upstream side pressure conduit and the downstream side pressure conduit do not interfere, and the entire exhaust gas purification device can be formed compactly.

(7) In addition, according to the present invention, the engine side space formed on the engine side and the pump side space formed on the hydraulic pump side are provided in the vehicle body so as to prevent working oil from flowing from the pump side space to the engine. A partition member in which the side space is scattered, the partition member is composed of a bottom plate portion extending the upper side of the hydraulic pump in a direction away from the engine, and a vertical wall extending upward at an end portion of the bottom plate portion in a direction away from the engine. On the other hand, the above-mentioned engine is provided with a support member for supporting the above-mentioned exhaust gas purification device. A purification device support portion extending in a direction in which the engine is separated is formed, the exhaust gas purification device is mounted on the purification device support portion of the support member, and the moving path is the space on the engine side, formed between the vertical plate portion of the partition member and the engine. The above-mentioned pressure sensor is located at a position deviated from the moving route of the above-mentioned filter cylinder, and is installed on any one of the above-mentioned support member, the upstream cylinder, and the downstream cylinder.

According to this configuration, the engine side space and the pump side space can be partitioned by the partition member composed of the bottom plate portion and the vertical plate portion, thereby preventing the working oil from scattering from the pump side space to the engine side space. In addition, the exhaust gas purification device can be mounted on the engine via the supporting member. Thereby, a movement path can be formed between the vertical plate part of the said partition member, and an engine. In addition, the pressure sensor can be mounted using any one of the supporting member, the upstream cylinder, and the downstream cylinder.

(8). According to the present invention, there is further provided a mounting frame provided on the vehicle body for disposing the partitioning member above the hydraulic pump, and the mounting frame is composed of a rectangular frame portion holding the partitioning member from the periphery, and a The frame portion extends downward and is constituted by a plurality of leg portions attached to the vehicle body, and the moving path is a range surrounded by the frame portion of the mounting frame. Accordingly, the partition member can be held on the mounting frame portion, and the movement path of the filter cartridge can be provided within the frame portion of the mounting frame.

Description of drawings

FIG. 1 is a front view showing a hydraulic excavator used in a first embodiment of the present invention.

Fig. 2 is an enlarged plan view of the upper revolving body in Fig. 1 in a state in which a cab, a machine casing, and a working device are omitted.

Fig. 3 is an enlarged plan view showing an enlarged main part of the vicinity of the engine and the exhaust gas purification device in Fig. 2 .

Fig. 4 is an enlarged perspective view of main parts in the vicinity of the engine and the exhaust gas purification device shown together with a part of the revolving frame.

Fig. 5 is an enlarged perspective view showing the engine and the exhaust gas purification device at the same positions as in Fig. 4 , with the mounting frame and partition members removed.

6 is an enlarged cross-sectional view of main parts of the engine, the support member, the partition member, and the exhaust gas purifying device viewed from the direction of arrow VI-VI in FIG. 1 .

Fig. 7 is an enlarged perspective view showing a state in which the exhaust gas purifying device of the first embodiment is attached to a supporting member.

FIG. 8 is an exploded perspective view at the same position as FIG. 7 , showing a state where the filter cylinder is detached from the upstream cylinder and the downstream cylinder through the movement path.

Fig. 9 is an external perspective view of the mounting frame and the partition member viewed from the side opposite to the engine.

Fig. 10 is an external perspective view of the mounting frame and the partition member viewed from the engine side.

Fig. 11 is an external perspective view showing a support member alone.

Fig. 12 is an external view of the exhaust gas purification device viewed from the engine side.

Fig. 13 is a longitudinal sectional view showing the internal structure of the exhaust gas purifying device.

Fig. 14 is an enlarged perspective view showing a state in which the exhaust gas purifying device of the second embodiment is mounted on a supporting member.

Fig. 15 is an enlarged perspective view showing a state in which the exhaust gas purifying device of the third embodiment is mounted on a support member.

Fig. 16 is an external view of the exhaust gas purification device in Fig. 15 viewed from the engine side.

Fig. 17 is an external view of an exhaust gas purification device according to a first modification viewed from the engine side.

Fig. 18 is an enlarged perspective view showing a state in which an exhaust gas purifying device according to a second modified example is attached to a supporting member.

in:

1-hydraulic excavator, 2-lower traveling body (car body), 3-upper revolving body (car body), 8-engine, 8E-exhaust pipe, 10-hydraulic pump, 15-installation frame, 15A-frame , 15B-foot, 16-partition part, 16A-bottom plate, 16B-longitudinal plate, 17-engine side space, 18-pump side space, 19-support part, 19A-installation part, 19B-purification device support part , 19C, 52, 62-bracket, 20, 41, 51, 61, 71-exhaust gas purification device, 21, 42-upstream cylinder, 22, 25, 27-cylindrical box 24, 43-downstream cylinder, 26 -Filter cylinder, 28-Particulate matter removal filter, 30-Moving route, 31, 53, 63-Pressure detection device, 32, 54, 64-Upstream side pressure conduit, 33, 55, 65-Downstream side pressure Catheter, 34, 56, 66 - pressure sensor, S - insertion space.

Detailed ways

Hereinafter, as a construction machine according to an embodiment of the present invention, a crawler-type hydraulic excavator will be described in detail with reference to the drawings.

First, FIGS. 1 to 13 show a first embodiment of the present invention. In FIG. 1 , reference numeral 1 is a crawler-type hydraulic excavator as a representative example of a construction machine. The hydraulic excavator 1 roughly includes a self-propelled lower traveling body 2 , which is mounted on the lower traveling body 2 so as to be able to turn. Together with the lower traveling body 2 , an upper swing body 3 of the vehicle body and a working device 4 provided on the front side of the upper swing body 3 so as to be capable of pitching and performing excavation operations such as sand and soil are formed. Furthermore, the lower traveling body 2 and the upper revolving body 3 are specific examples of the vehicle body of the present invention.

Here, the upper swing body 3 constituting the hydraulic excavator 1 will be described in detail using FIGS. 1 to 7 .

Reference numeral 5 denotes a revolving frame of the upper revolving body 3 , and the revolving frame 5 constitutes a support structure of the upper revolving body 3 . In addition, as shown in FIG. 2 , the revolving frame 5 generally includes: a bottom plate 5A made of a thick-walled steel plate extending in the front and rear directions; The left vertical plate 5B and the right vertical plate 5C extending in the front and rear directions at intervals; the left side frame 5D configured to have intervals in the left and right directions of the respective vertical plates 5B and 5C and extending in the front and rear directions 1. Right side frame 5E; a plurality of outrigger beams 5F extending outward from the bottom plate 5A, each vertical plate 5B, 5C in the left and right directions and supporting the left and right side frames 5D, 5E at their front ends. In addition, the work implement 4 is mounted so as to be capable of pitching at the center position in the left-right direction on the front side of each of the vertical plates 5B, 5C, and an engine 8 to be described later is provided on the rear side of the revolving frame 5 . wait.

Reference numeral 6 is a cab (refer to FIG. 1 ) installed on the left front side of the revolving frame 5 (the left side of the foot of the working device 4 ). A driver's seat to be seated, an operating lever for traveling, an operating lever for working, and the like (none of which are shown in the figure).

Reference numeral 7 denotes a counterweight mounted on the rear end portion of the swing frame 5 . The counterweight 7 is weight-balanced with the work implement 4, and protrudes so as to bend toward the rear side as shown in FIG. 2 .

Reference numeral 8 is an engine provided on the rear side of the revolving frame 5 , and the engine 8 is a part of the vehicle body, and is mounted in a horizontal state extending in the left and right directions on the front side of the counterweight 7 . In addition, as shown in FIGS. 4 and 5 , a cooling fan 8A for supplying cooling air to a heat exchanger 9 described later is provided on the left side of the engine 8 .

On the other hand, the right side, which is one side in the longitudinal direction of the engine 8, serves as a pump mounting portion 8B for mounting a hydraulic pump 10 to be described later. In addition, a supercharger 8C such as a turbocharger, which is connected to the exhaust manifold 8D to increase the flow rate of intake air, is provided on the upper part of the front side of the engine 8. The supercharger 8C is arranged in the left and right direction. The extended way is connected with the exhaust pipe 8E. And, the engine 8 is supported by the revolving frame 5 in a vibration-proof state by, for example, four vibration-proof members 8F (only three are shown in FIG. 5 ).

Reference numeral 9 denotes a heat exchanger arranged on the left side of the engine 8 (see FIG. 2 ), and the heat exchanger 9 is provided so as to face the cooling fan 8A. In addition, the heat exchanger 9 is constituted by, for example, a radiator for cooling engine cooling water, an oil cooler for cooling operating oil, an intercooler for cooling air taken in by the engine 8 , and the like.

Reference numeral 10 is a hydraulic pump arranged on the right side of the engine 8 , and the hydraulic pump 10 is driven by the engine 8 to discharge working oil as pressure oil supplied from a working oil tank 12 described later. 5 and 6, the hydraulic pump 10 has a flange 10A at one end of the bottom, and the flange 10A is attached to the pump mounting portion 8B of the engine 8 using a plurality of bolts 11 . Here, when the hydraulic pump 10 is mounted to the engine 8 with the bolts 11 , the hydraulic pump 10 is mounted together with a mounting portion 19A of a support member 19 which will be described later.

Reference numeral 12 is an operating oil tank (refer to FIG. 2 ) provided on the right side of the revolving frame 5 on the front side of the hydraulic pump 10, and the operating oil tank 12 stores the working fluid for driving the lower traveling body 2, the working device 4, and the like. Oil. In addition, reference numeral 13 denotes a fuel tank provided on the front side of the working oil tank 12 .

Reference numeral 14 is a casing (refer to FIG. 1 ) covering the engine 8, the heat exchanger 9, the exhaust gas purification device 20, etc., and the casing 14 roughly includes: A left side cover (not shown) on the side, a right side cover 14A located on the right side of the upper swing body 3 and covers the side of the hydraulic pump 10 , and an upper cover 14B covering the upper side of the engine 8 and the like. In addition, an engine cover 14C is openably and closably provided on the upper cover 14B to close an opening (not shown) for maintenance work.

In addition, reference numeral 15 is an attachment frame provided on the revolving frame 5 for arranging a partition member 16 described later above the hydraulic pump 10 . The mounting frame 15 includes: a rectangular (rectangular) frame portion 15A that keeps the upper end side of the partition member 16 from around; The foot of the root 15B. Here, the frame portion 15A and the leg portion 15B of the mounting frame 15 surround the exhaust gas purifying device 20 and the support member 19 described later, and the moving route 30 described below is a range surrounded by the frame portion 15A.

Reference numeral 16 is a partition member called a firewall located in the casing 14 and provided on the right side of the engine 8 . The partition member 16 is mounted on the revolving frame 5 through the mounting frame 15 to partition between the engine 8 and the hydraulic pump 10 . In addition, as shown in FIG. 6 , the partition member 16 roughly includes: a bottom plate portion 16A extending horizontally in a direction separating the engine 8 between the hydraulic pump 10 and the cleaning device support portion 19B of the support member 19 ; The rear end (the end in the direction of separation from the engine 8) of the longitudinal plate portion 16B extending upward; the front plate portion 16C (refer to FIGS. 9 and 10 ).

Then, the partition member 16 attached to the mounting frame 15 shields between the engine 8 and the hydraulic pump 10 through the bottom plate portion 16A and the vertical plate portion 16B, thereby partitioning the space therebetween. Thus, as shown in FIG. 6 , an engine-side space 17 in which the engine 8 and the exhaust gas purification device 20 are arranged and a pump-side space 18 in which the hydraulic pump 10 is arranged are formed by the partition member 16 in the casing 14 . Therefore, even if hydraulic pump 10 leaks working oil, partition member 16 can prevent the leaked working oil from being scattered to engine 8 side, thereby preventing fire and the like in advance.

Reference numeral 19 is a support member located on the upper side of the hydraulic pump 10 and provided on the right side of the engine 8 . As shown in FIGS. 6 to 8 , the support member 19 is formed in a substantially inverted L-shape as a support stand, and supports an exhaust gas purification device 20 described later in the engine side space 17 . In addition, as shown in FIG. 6 and FIG. 11 , the supporting member 19 includes: a mounting portion 19A mounted on the engine 8 extending almost vertically on the left side as the engine 8 side, from the mounting portion 19A toward the right side (from The direction in which the engine 8 separates) extends almost horizontally to the purification device support portion 19B. In addition, the support member 19 has its attachment portion 19A in contact with the flange portion 10A of the hydraulic pump 10 , and is attached to the pump attachment portion of the engine 8 on the vehicle body side together with the flange portion 10A using bolts 11 in this state. on 8B.

In addition, a bracket 19C for attaching a pressure sensor 34 described later is provided so as to protrude upward on the purification device support portion 19B of the support member 19 . The bracket 19C is formed in the shape of a long plate extending in the vertical direction, the lower part is fixed to the middle part in the longitudinal direction of the purification device support part 19B, and the pressure sensor 34 is attached to the upper part. In addition, the bracket 19C arranges the pressure sensor 34 constituting the pressure detection device 31 described later, the upstream side pressure conduit 32 and the downstream side pressure conduit 33 connected to the pressure sensor 34 so as to move from the filter cylinder 26 described later. Route 30 detachment location.

That is, the pressure sensor 34 is attached to the upper end portion of the bracket 19C. In addition, an upstream side pressure conduit 32 and a downstream side pressure conduit 33 are provided along the outer peripheral surfaces of the upstream cylinder body 21 and the downstream cylinder body 24 so as not to interfere with the installation and detachment of the filter cylinder body 26, and their front ends are respectively Connect with pressure sensor 34.

Next, the exhaust gas purification device 20 of the first embodiment for removing and purifying harmful particulate matter (PM: Particulate Matter) contained in the exhaust gas discharged from the engine 8 will be described.

That is, reference numeral 20 denotes an exhaust gas purification device located on the upper right side of the engine 8 as a part of the engine 8 and connected to the exhaust pipe 8E. The exhaust gas purification device 20 removes particulate matter contained in the exhaust gas flowing through the exhaust pipe 8E. In addition, as shown in FIGS. 2 to 4 , the exhaust gas purification device 20 is vertically arranged in the engine side space 17 such that the front side in the front-rear direction is the upstream side and the rear side is the downstream side. Furthermore, the exhaust gas purifying device 20 roughly includes an upstream cylinder 21 , a downstream cylinder 24 , a filter cylinder 26 , a particulate matter removing filter 28 , a pressure detection device 31 , and the like, which will be described later.

In addition, as shown in FIG. 7 , an exhaust gas purifying device 20 is constituted by connecting three cylinders, an upstream cylinder 21 , a downstream cylinder 24 , and a filter cylinder 26 , which will be described later, with bolts and nuts 29 . Moreover, as shown in FIG. 13 , the oxidation catalyst 23 is accommodated in the upstream cylinder body 21 , and the particulate matter removal filter 28 is accommodated in the filter cylinder body 26 .

First, reference numeral 21 is an upstream cylindrical body located on the front side (upstream side) of the exhaust gas purification device 20 and connected to the exhaust pipe 8E. This upstream cylindrical body 21 constitutes an inlet portion into which exhaust gas flows. That is, as shown in FIGS. 6 to 8 , the upstream cylindrical body 21 roughly includes a cylindrical case 22 and an oxidation catalyst 23 housed in the cylindrical case 22 .

Reference numeral 22 is a cylindrical case constituting the outer shape of the upstream cylindrical body 21, and the cylindrical case 22 includes a large-diameter cylindrical portion 22A, and is provided so as to close the front side (upstream side) of the cylindrical portion 22A. The cover part 22B of the said cylindrical part 22A and the flange part 22C provided so that diameter may expand in the rear side (downstream side) of the said cylindrical part 22A. Here, the flange portion 22C is attached to the front flange portion 27B of the cylindrical case 27 constituting the filter cartridge 26 using bolts and nuts 29 described later. Thereby, when the bolt and the nut 29 are removed and the connection is released, the flange portion 22C can be lifted upward in the radial direction to remove the filter cartridge 26 .

In addition, an inflow pipe 22D having a sound-absorbing function is provided to pass through in the radial direction of the cylindrical portion 22A on the front side (upstream side) of the cylindrical case 22 . Further, support legs 22E for fixedly mounting on the purification device support portion 19B of the support member 19 are provided on the lower side of the cylindrical portion 22A.

In addition, as shown in FIG. 12 , the cylindrical case 22 is provided with a pressure take-out part 22F on the upstream side of the left side of the cylindrical part 22A. The pressure on the upstream side of the particulate matter removal filter 28 is taken out, and is connected to a pressure sensor 34 described later through an upstream side pressure conduit 32 .

Reference numeral 23 is an oxidation catalyst installed in the cylindrical case 22 on the downstream side, and the oxidation catalyst 23 oxidizes and removes harmful substances such as nitrogen monoxide (NO), carbon monoxide (CO), and hydrocarbons (HC) contained in the exhaust gas. . In addition, the oxidation catalyst 23 is made of, for example, a honeycomb cylinder made of ceramics, a large number of through-holes 23A are formed in the axial direction, and the inner surface is coated with noble metal or the like.

Next, reference numeral 24 is a downstream cylindrical body which interposes a filter cylindrical body 26 described later and which is provided at a rear side position on the downstream side with respect to the upstream cylindrical body 21 . The downstream cylinder 24 constitutes an outlet portion from which exhaust gas flows out. That is, as shown in FIG. 13 , the downstream cylindrical body 24 is constituted by a cylindrical case 25 .

Reference numeral 25 is a cylindrical case constituting the downstream cylindrical body 24, which is almost the same as the cylindrical case 22 of the upstream cylindrical body 21, and includes: a large-diameter cylindrical portion 25A, arranged to close the cylindrical portion Cover portion 25B on the rear side (downstream side) of 25A, and flange portion 25C provided so as to expand in diameter on the front side (upstream side) of the above-mentioned cylindrical portion 25A. Here, the flange portion 25C is attached to the rear flange portion 27C of the cylindrical case 27 constituting the filter cartridge 26 using bolts and nuts 29 .

In addition, on the rear side (downstream side) of the cylindrical case 25, an outflow pipe 25D having a sound-absorbing function is provided so as to penetrate the cylindrical portion 25A in the radial direction (upward and downward directions), and the upper part thereof serves as a tail pipe. Further, support legs 25E for fixedly mounting on the purification device support portion 19B of the support member 19 are provided on the lower side of the cylindrical portion 25A.

The cylindrical case 25 is further provided with a pressure extraction part 25F located on the downstream side of the left side of the cylindrical part 25A, and the pressure extraction part 25F extracts the particulate matter removal filter 28 from the pressure of the exhaust gas flowing through the exhaust gas passage The pressure on the downstream side is connected to a pressure sensor 34 described later through a downstream side pressure conduit 33 .

Here, the upstream cylindrical body 21 can be fixedly mounted on the purification device support portion 19B of the support member 19 via the support legs 22E, and the downstream cylinder body 24 can be fixedly mounted on the purification device support portion 19B via the support legs 25E. In this state, as shown in FIG. 8 , an insertion space S for attaching a filter cylinder 26 described later can be formed between the upstream cylinder 21 and the downstream cylinder 24 . Thus, the exhaust gas purification device 20 can be configured by fixing the upstream cylindrical body 21 and the downstream cylindrical body 24 to the supporting member 19 in a state where the insertion space S of the filter cylindrical body 26 is ensured with respect to the supporting member 19 . for subassemblies.

In addition, reference numeral 26 is a filter cartridge 26 for removing particulate matter provided between the upstream cartridge 21 and the downstream cartridge 24 . The filter cartridge 26 forms the main body of the exhaust gas purifying device 20 and is roughly composed of a cylindrical case 27 and a particulate matter removing filter 28 which will be described later.

Reference numeral 27 is a cylindrical case constituting the outer shape of the filter cylinder 26, and the cylindrical case 27 includes: a cylindrical portion 27A, and a front side provided with an enlarged diameter on the front side (upstream side) of the cylindrical portion 27A. The flange portion 27B and the rear flange portion 27C are provided with an enlarged diameter on the rear side (downstream side) of the cylindrical portion 27A.

Then, as shown in FIG. 8 , only by loosening and removing the bolts and nuts 29, the cylindrical case 27 can be detached from the support member 19 and lifted as a separate component, and then the cylindrical case 27 can be moved to a place where maintenance work is performed. other working positions. On the other hand, the cylindrical case 27 after the maintenance work can be connected and assembled in the insertion space S between the upstream cylindrical body 21 and the downstream cylindrical body 24 . In this case, examples of maintenance work include cleaning work to remove ash components accumulated in the particulate matter removal filter 28, inspection work to confirm the presence or absence of damage, repair of damaged parts, or replacement of parts. repair work, etc.

Reference numeral 28 is a particulate matter removal filter (usually also referred to as Diesel Particulate Filter, and may also be abbreviated as DPF) accommodated in a cylindrical case 27, and the particulate matter removal filter 28 is discharged from the engine 8 by trapping Particulate matter (PM) in the exhaust gas to purify the exhaust gas.

Then, the particulate matter removal filter 28 is formed as, for example, a honeycomb cylinder in which a large number of small holes 28A are provided in the axial direction on a porous member made of a ceramic material, and each small hole 28A is adjacent to each other and different from each other. The end portion of is closed by the sealing member 28B. Thus, the particulate matter removing filter 28 traps the particulate matter by passing the exhaust gas flowing into the small hole 28A from one side through the porous material, and sends the purified exhaust gas from the adjacent small hole 28A to the other side. flow out.

On the other hand, the particulate matter removing filter 28 detects the pressure on the upstream side and the pressure on the downstream side by the pressure detecting device 31 described later. When there is a lot of particulate matter, burn the particulate matter to remove it. However, even if the particulate matter is burned, a part of it becomes ash and gradually accumulates in the small holes 28A. In addition, other unburned residues, such as heavy metals, calcium, etc. in the engine oil also slowly build up. Therefore, the particulate matter removal filter 28 is changed to remove the deposit by detaching the filter cartridge 26 .

Reference numeral 29 is a large number of bolts and nuts respectively arranged between the upstream cylinder body 21 and the filter cylinder body 26 and between the downstream cylinder body 24 and the filter cylinder body 26, and the bolts and nuts 29 can be disassembled respectively. between the flange portion 22C of the upstream cylinder body 21 and the front side flange portion 27B of the filter cylinder body 26, and between the flange portion 25C of the downstream cylinder body 24 and the rear side flange portion 27C of the filter cylinder body 26 between.

Next, reference numeral 30 denotes a movement route in the case of detaching the filter cylinder 26 from the upstream cylinder 21 and the downstream cylinder 24 and moving to another position, or returning from another position and installing it. This movement path 30 is formed in the engine side space 17, the space in the up and down direction between the engine 8 and the vertical plate portion 16B of the partition member 16, for example, the space extending from the top of the filter cylinder 26 to the left and right. Within the range of the fan-shaped angle α (the space enclosed by the dashed-two dotted lines in FIG. 6 ).

In addition, in the embodiment, since the exhaust gas purification device 20 is surrounded by the frame portion 15A and the respective leg portions 15B of the mounting frame 15 for mounting the partition member 16, the movement route 30 is provided in the engine side space 17, and the Between the vertical plate part 16B of the partition member 16 and the engine 8, it exists in the range surrounded by the frame part 15A.

Here, the movement path 30 can be used as a passage for moving the filter cartridge 26 when attaching or detaching the filter cartridge 26 for maintenance work of the particulate matter removing filter 28 . Thus, the filter cylinder 26 can be detached as a separate component from between the upstream cylinder 21 and the downstream cylinder 24, and can be moved to another working position in the detached state. Other working positions return between the upstream cylinder body 21 and the downstream cylinder body 24 .

In addition, the exhaust gas purification device 20 is installed near the engine 8 so that particulate matter in the exhaust gas can be treated at a high temperature. Therefore, many devices and components such as the engine 8 , the hydraulic pump 10 , the mounting frame 15 , the partition member 16 , and hydraulic piping (not shown) are arranged around the exhaust gas purification device 20 . Therefore, there is an upstream cylinder body 21 on the front side of the filter cylinder body 26, a downstream cylinder body 24 on the rear side, an engine 8 on the left side, a longitudinal plate portion 16B of the partition member 16 on the right side, and a support on the lower side. The cleaning device support part 19B of the component 19. In addition, the exhaust gas purification device 20 is arranged within a range surrounded by the frame portion 15A of the mounting frame 15 .

As a result, a narrow space opened only upward is formed at a position near the engine 8 where the exhaust gas purification device 20 is arranged. However, by arranging the pressure conduits 32 and 33 and the pressure sensor 34 of the pressure detection device 31 described later at positions deviated from the movement path 30, the filter cartridge 26 can be easily attached and detached even in a narrow space.

In addition, reference numeral 31 is a pressure detection device for detecting the accumulation state (clogging state) of the particulate matter of the particulate matter removing filter 28 . The pressure detection device 31 includes an upstream pressure conduit 32 , a downstream pressure conduit 33 , and a pressure sensor 34 .

Reference numeral 32 is an upstream side pressure conduit provided between the upstream cylindrical body 21 and a pressure sensor 34 described later, and the upstream side pressure conduit 32 connects the inside of the cylindrical case 22 on the upstream side of the particulate matter removing filter 28 . The pressure is guided to the pressure sensor 34. Furthermore, the upstream side pressure conduit 32 is arranged along the outer peripheries of the upstream cylindrical body 21 and the filter cylindrical body 26 , and one end thereof is connected to the pressure extraction part 22F of the cylindrical case 22 , and the other end thereof is connected to the pressure sensor 34 .

In addition, reference numeral 33 is a downstream side pressure conduit provided between the downstream cylindrical body 24 and the pressure sensor 34 , and the downstream side pressure conduit 33 transfers the pressure in the tubular case 25 on the downstream side of the particulate matter removing filter 28 . The pressure is directed towards a pressure sensor 34 . The downstream side pressure conduit 33 is arranged along the outer peripheries of the downstream cylinder body 24 and the filter cylinder body 26 , and one end thereof is connected to the pressure extraction part 25F of the cylindrical case 25 , and the other end thereof is connected to the pressure sensor 34 .

Reference numeral 34 is a pressure sensor provided at the front end of the bracket 19C of the support member 19 , and the pressure sensor 34 detects the pressure before and after the particulate matter removing filter 28 . That is, the pressure sensor 34 is composed of, for example, a piezoelectric element, and detects the pressure between the upstream side and the downstream side ( differential pressure). In addition, the pressure sensor 34 is connected to the pressure output part 22F of the cylindrical case 22 of the upstream cylindrical body 21 through the upstream side pressure conduit 32, and is connected to the pressure output part 25F of the cylindrical case 25 of the downstream cylindrical body 24 through the downstream side pressure conduit 33. .

Here, since the pressure sensor 34 is attached to the bracket 19C of the support member 19 separated from the filter cylinder 26 to the left, the pressure sensor 34 can be arranged together with the upstream side pressure conduit 32 and the downstream side pressure conduit 33 . A position offset from the path of travel 30 of the filter cartridge 26 . Therefore, the pressure sensor 34 can be arranged at a position where it does not interfere when the filter cylinder 26 is attached to and detached from the upstream cylinder 21 and the downstream cylinder 24 in the vertical direction.

The exhaust gas purifying device 20 according to the first embodiment has the above-mentioned structure, and the assembly operation thereof will be described next.

First, make the flange portion 22C of the cylindrical case 22 forming the upstream cylindrical body 21 face the front flange portion 27B of the cylindrical case 27 forming the filter cylindrical body 26, and use bolts and nuts in this state. 29 Fasten both.

Similarly, make the flange portion 25C of the cylindrical case 25 forming the downstream cylindrical body 24 face the rear side flange portion 27C of the cylindrical case 27 forming the filter cylindrical body 26, and in this state use bolts, Nuts 29 fasten both.

Thereby, the upstream cylinder body 21, the downstream cylinder body 24, and the filter cylinder body 26 can be assembled in series so that they may be located in a substantially coaxial position. In addition, they can also be disassembled when the bolts and nuts 29 are loosened and removed.

In addition, one end of the upstream side pressure conduit 32 is connected to the pressure extraction part 22F of the cylindrical case 22 , and the other end is connected to the pressure sensor 34 . Similarly, one end of the downstream side pressure conduit 33 is connected to the pressure take-out portion 25F of the cylindrical case 25 , and the other end is connected to the pressure sensor 34 .

Then, after connecting the upstream cylinder 21 , the downstream cylinder 24 , and the filter cylinder 26 , and connecting the pressure sensor 34 and the like, the exhaust gas purification device 20 is placed on the purification device support portion 19B of the support member 19 . In this state, the supporting feet 22E of the upstream cylinder body 21 are fixed on the purification device support part 19B using bolts and nuts 35, and the support feet 25E of the downstream cylinder body 24 are fixed on the purification device support part using bolts and nuts 35. on 19B. Furthermore, a pressure sensor 34 is mounted on the upper portion of the bracket 19C of the supporting member 19 . Thus, the exhaust gas purification device 20 can be attached to the supporting member 19 (on the side of the engine 8 ), thereby constituting a purification device subassembly.

The hydraulic excavator 1 according to the first embodiment has the above-mentioned configuration, and its operation will be described next.

First, the operator gets on the cab 6 of the upper revolving structure 3 , starts the engine 8 and drives the hydraulic pump 10 . Accordingly, the pressure oil from the hydraulic pump 10 is supplied to various actuators through the control valve. In addition, when the operator riding in the cab 6 operates the operating lever for traveling, the lower traveling body 2 can be moved forward or backward. On the other hand, by operating the operation lever for operation, the operation device 4 is tilted, so that excavation work of sand and soil, etc. can be performed.

Furthermore, when the engine 8 is running, harmful particulate matter is discharged from its exhaust pipe 8E. At this time, the exhaust gas purification device 20 can discharge the purified exhaust gas to the outside by trapping the particulate matter with the particulate matter removing filter 28 . On the other hand, after a predetermined amount of particulate matter collected by the particulate matter removing filter 28 has accumulated, it is removed by combustion (regenerated). In addition, when the particulate matter is burnt, the burned ash component gradually accumulates in the particulate matter removing filter 28 . Therefore, it is necessary to perform a cleaning operation for removing the ash components accumulated in the particulate matter removing filter 28 .

Therefore, a description will be given of a case where a cleaning operation is performed in order to remove the ash component of the particulate matter deposited on the filter cartridge 26 and the particulate matter removal filter 28 .

In the cleaning operation of the particulate matter removal filter 28, it is necessary to remove the filter cylinder 26, remove the bolts and nuts 29 connecting the upstream cylinder 21 and the filter cylinder 26, and remove the connection between the downstream cylinder 24 and the filter cylinder 26. The bolts and nuts 29 of the filter cylinder 26. At this time, the filter cylinder body 26 is connected and installed on the upstream cylinder body 21 and the downstream cylinder body 24 through flat flanges without snap fitting. As a result, the filter cylinder 26 can be easily removed from between the upstream cylinder 21 and the downstream cylinder 24 by lifting it up, and the filter cylinder 26 can be taken out from the outside of the casing 14 through the moving path 30 .

In addition, the upstream side pressure conduit 32 , the downstream side pressure conduit 33 , and the pressure sensor 34 are arranged at positions deviated to the left side of the moving path 30 as a passage when the filter cartridge 26 is lifted. In this way, although the moving route 30 is provided in a narrow and limited fan-shaped space with an angle α that is open only on the upper side, the filter cylinder 26 can be used without being affected by the upstream side pressure conduit 32, the downstream side pressure conduit 33, and the pressure. The sensor 34 is simply moved in such a way that the cleaning operation takes place.

Then, when the filter cylinder 26 is moved to another working position, for example, compressed air can be blown to the particulate matter removing filter 28 in the filter cylinder 26 to remove the ash component of the accumulated particulate matter.

In addition, when the cleaning operation is completed, the filter cylinder 26 is inserted into the insertion space S through the moving path 30 and fastened to the upstream cylinder 21 and the downstream cylinder 24 using bolts and nuts 29 .

Thus, according to the first embodiment, the upstream cylindrical body 21 and the downstream cylindrical body 24 are fixedly provided with respect to the engine 8 side, and the filter cylindrical body 26 can be attached and detached from the upstream cylindrical body 21 and the downstream cylindrical body 24 . Therefore, only the filter cartridge 26 can be detached with the upstream cylinder 21 and the downstream cylinder 24 remaining on the engine 8 side.

As a result, maintenance operations such as cleaning, inspection, and repair of the particulate matter removing filter 28 can be easily performed by simply moving the filter cartridge 26 to another operating position, thereby improving workability.

Furthermore, the upstream side pressure conduit 32, the downstream side pressure conduit 33, and the pressure sensor 34, which are provided for detecting the accumulation state of the particulate matter in the particulate matter removing filter 28, are configured to be arranged at positions deviated from the moving route 30, and the The movement route 30 is the movement route 30 when the filter cylinder 26 is detached from the upstream cylinder 21 and the downstream cylinder 24 and moved to another position, or returned from another position.

Therefore, by providing the moving route 30, even if the filter cylinder 26 disposed in a narrow space with many obstacles around is removed and installed for maintenance work, it will not be blocked by the upstream side pressure conduit. 32. The downstream side pressure conduit 33 and pressure sensor 34 are in the way, so it is not necessary to remove these parts.

As a result, only the filter cartridge 26 can be easily attached and detached in a state where the upstream cylinder 21, the downstream cylinder 24, the pressure sensor 34, etc. are still installed on the engine 8 side, so that it can be easily built into the filter cylinder 26 The maintenance work of the particulate matter removal filter 28 in the

In addition, since the pressure sensor 34 is mounted on the upper part of the bracket 19C provided on the supporting member 19, the state of the pressure sensor 34, the connection of the pressure conduits 32, 33 with respect to the pressure sensor 34 can be easily checked by visual observation. Condition, etc. In addition, since it is easy to reach by hand, it can also be repaired. As a result, workability in assembly work, maintenance work, and the like can be improved.

On the other hand, since the partition member 16 partitioning the engine side space 17 and the pump side space 18 is provided, it is possible to prevent, for example, the leaked working oil from scattering to the high temperature engine 8 side, thereby improving safety and reliability.

In this way, even if the installation frame 15 and the partition member 16 are provided and become narrower, the moving path 30 for moving the filter cartridge 26 can be formed between the vertical plate portion 16B of the partition member 16 and the engine 8. between. Thereby, the filter cylinder 26 can be moved to the work position for maintenance work through the said movement path 30, or can also be returned between each cylinder 21,24 from the work position.

In addition, since the upstream cylindrical body 21, the downstream cylindrical body 24, and the pressure sensor 34 are attached to the support member 19 provided on the engine 8, the pressure sensor 34 can be arranged at the same vibration level as the respective cylindrical bodies 21, 24. within the system. This prevents damage to the pressure conduits 32 , 33 connecting the pressure sensor 34 and the cylinders 21 , 24 , thereby extending the life of the pressure detection device 31 .

In addition, the upstream pressure conduit 32 and the downstream pressure conduit 33 are arranged along the outer peripheries of the upstream cylinder 21 , the downstream cylinder 24 , and the filter cylinder 26 at positions deviated from the movement path 30 of the filter cylinder 26 . As a result, the upstream side pressure conduit 32 and the downstream side pressure conduit 33 do not interfere, so that the filter cylinder 26 can be moved, and the entire exhaust gas purification device 20 including the pressure sensor 34 can be formed compactly, even in a narrow place. It can also be set.

Next, FIG. 14 shows an exhaust gas purification device according to a second embodiment of the present invention. The present embodiment is characterized in that the upstream cylindrical body and the downstream cylindrical body are each fixedly attached to a support member on the engine side using U bolts. In addition, in the second embodiment, the same reference numerals are assigned to the same components as those in the first embodiment described above, and description thereof will be omitted.

In FIG. 14 , reference numeral 41 denotes an exhaust gas purification device of a second embodiment. In addition, reference numeral 42 is an upstream cylindrical body of the above-mentioned exhaust gas purification device 41 , and this upstream cylindrical body 42 is different from the upstream cylindrical body 21 of the first embodiment in that no supporting legs are provided. In addition, reference numeral 43 is the downstream cylindrical body of the said exhaust gas purification apparatus 41, This downstream cylindrical body 43 differs from the downstream cylindrical body 24 of 1st Embodiment in the point that a support leg is not provided almost similarly to the upstream cylindrical body 42.

Reference numeral 44 is a U-bolt provided so as to surround the upstream cylindrical body 42 and the downstream cylindrical body 43 , and the U-bolt 44 fixes the exhaust gas purification device 41 to the support member 19 . And, U bolt 44 is arranged to surround upstream cylindrical body 42 and downstream cylindrical body 43 from the upper side, and the two front end sides that are engraved with male screw thread pass through the purification device support portion 19B of support member 19, pass its protruding portion and nut (not shown). (shown) threaded combination can fix the upstream cylindrical body 42 and the downstream cylindrical body 43 on the supporting member 19.

In this way, even in the second embodiment configured in this way, almost the same effects as those of the first embodiment described above can be obtained. In particular, in the second embodiment, the upstream cylindrical body 42 and the downstream cylindrical body 43 of the exhaust gas purification device 41 can be attached to the support member 19 at low cost by using commercially available U-bolts 44 and the like.

Next, FIGS. 15 and 16 show an exhaust gas purification device according to a third embodiment of the present invention. This embodiment is characterized in that the pressure sensor is configured to be attached to the upstream cylindrical body at a position deviated from the moving path of the filter cylindrical body. In addition, in the third embodiment, the same reference numerals are assigned to the same components as those in the first embodiment described above, and description thereof will be omitted.

In FIGS. 15 and 16 , reference numeral 51 denotes an exhaust gas purification device according to a third embodiment. In addition, reference numeral 52 denotes a bracket provided on the outer peripheral side of the upstream cylindrical body 21 for mounting a pressure sensor 56 described later. The bracket 52 is, for example, formed in a simple shape in which only a plate body is bent into a substantially L-shape, and is connected to the flange portion 22C of the cylindrical case 22 using bolts and nuts 29 .

Here, the bracket 52 is formed, for example, by bending a rectangular plate body into an L-shape. In addition, one end portion of the bracket 52 extends downward to form a fixing portion 52A, and the other end portion extends toward the upstream cylindrical body 21 side to form a sensor mounting portion 52B. Furthermore, the fixing portion 52A is connected to the flange portion 22C of the cylindrical case 22 using bolts and nuts 29 . In this way, since the bracket 52 is provided on the outer peripheral side of the upstream cylinder body 21, by mounting the pressure sensor 56 on the sensor mounting portion 52B of the bracket 52, the pressure sensor 56 can be arranged while moving from the filter cylinder body 26. Where route 30 deviates to the front.

Reference numeral 53 is a pressure detection device according to the third embodiment, and the pressure detection device 53 includes an upstream pressure conduit 54 , a downstream pressure conduit 55 , and a pressure sensor 56 .

Reference numeral 54 denotes an upstream side pressure conduit of the pressure detection device 53, which is arranged along the outer periphery of the upstream cylinder body 21, one end of which is connected to the pressure extraction part 22F of the cylindrical case 22 of the upstream cylinder body 21, and the other One end is connected to a pressure sensor 56 described later. In addition, reference numeral 55 is a downstream side pressure conduit of the exhaust gas purification device 51, and the downstream side pressure conduit 55 is arranged along the outer circumference of the downstream cylinder body 24 and the filter cylinder body 26, and one end thereof is connected to the cylindrical case 25 of the downstream cylinder body 24. The pressure output part 25F is connected to the other end, and the pressure sensor 56 is connected to the other end.

Reference numeral 56 is a pressure sensor provided on the bracket 52 , and the pressure sensor 56 detects the pressure before and after the particulate matter removing filter 28 in almost the same manner as the pressure sensor 34 of the above-mentioned first embodiment. Furthermore, the pressure sensor 56 is connected to the inside of the cylindrical case 22 of the upstream cylindrical body 21 through the upstream side pressure conduit 54 , and is connected to the inside of the cylindrical case 25 of the downstream cylindrical body 24 through the downstream side pressure conduit 55 .

Here, the pressure sensor 56 is attached to the sensor attachment portion 52B of the bracket 52 provided on the outer peripheral side of the upstream cylindrical body 21 . Therefore, the pressure sensor 56 can be arranged at a position deviated from the movement path 30 of the filter cartridge 26 together with the upstream pressure conduit 54 and the downstream pressure conduit 55 . Thereby, the pressure sensor 56 can be arrange|positioned in the position which does not interfere when attaching and detaching the filter cylinder 26 in the up-down direction with respect to the upstream cylinder 21 and the downstream cylinder 24.

In this way, even in the third embodiment configured in this way, almost the same effects as those of the first embodiment described above can be obtained. In particular, in the third embodiment, the pressure sensor 56 can be attached to the bracket 52 having a simple shape by using the upstream cylindrical body 21 , so that the structure can be simplified.

Furthermore, in the third embodiment, by providing the bracket 52 on the outer peripheral side of the upstream cylindrical body 21, the pressure sensor 56 is mounted on the bracket 52 and the pressure sensor 56 and the like are arranged away from the filter cylindrical body. The case of the moving route 30 of 26 is described as an example. However, the present invention is not limited thereto, and may be configured as an exhaust gas purification device 61 according to a first modified example shown in FIG. 17 .

That is, in FIG. 17 , a bracket 62 may be provided on the outer peripheral side of the downstream cylindrical body 24 , and a pressure sensor 66 connected to each pressure conduit 64 , 65 of the pressure detection device 63 may be attached to the bracket 62 . Even in this case, the pressure sensor 66 can be arranged to be deviated from the moving route 30 of the filter cartridge 26 to the rear side.

In addition, in the first embodiment, the flange portions 22C, 25C, 27B, and 27C are respectively provided on the cylindrical cases 22 , 25 , and 27 of the upstream cylindrical body 21 , the downstream cylindrical body 24 , and the filter cylindrical body 26 . Furthermore, between the facing flange parts 22C and 27B, and between the flange parts 25C and 27C are mutually detachably connected by bolts and nuts 29 . However, the present invention is not limited thereto, and may be configured as an exhaust gas purifying device 71 of a second modified example shown in FIG. 18 .

That is, in FIG. 18 , it is also possible to set a V-shaped hoop 72 in cross section, and the hoop 72 surrounds the facing flange portions 22C and 27B of the upstream cylindrical body 21, the downstream cylindrical body 24, and the filter cylindrical body 26. The flange portions 25C and 27C are respectively connected between the facing flange portions 22C and 27B and between the flange portions 25C and 27C by tightening the V-shaped clip 72 in the circumferential direction with bolts 73 . This configuration can also be similarly applied to other embodiments.

On the other hand, in each embodiment, although it has been described that the partition member 16 is mounted on the revolving frame 5 using the mounting frame 15, it is sufficient that the partition member 16 can be used as a firewall to partition the engine side space 17 and the pump side space 18. It can be mounted on components other than the mounting frame 15. That is, for example, a bracket extending downward may be provided on the bottom plate portion 16A of the partition member 16 , and the bracket may be fixed to the revolving frame 5 . In this case, the mounting frame 15 including the frame portion 15A can be unnecessary.

In addition, in each embodiment, the case where the exhaust gas purification apparatus 20, 41, 51 is attached to the hydraulic excavator 1 provided with the crawler-type undercarriage 2 is demonstrated as an example. However, the present invention is not limited thereto, and may be mounted on, for example, a hydraulic excavator including a wheel-type undercarriage made of tires or the like. In addition, it can also be widely used in engine-mounted construction machinery such as crane trucks, hydraulic cranes, bulldozers, and the like.

Claims (6)

1. A kind of construction machine, it has: the vehicle body (2,3) that can self-propelled; The engine (8) that is loaded on this vehicle body (2,3); Be installed in the length direction of this engine (8) The hydraulic pump (10) on the side; the exhaust gas purification device (20, 41, 51, 61, 71) that is connected to the above-mentioned engine (8) to purify the exhaust gas through the exhaust pipe (8E), The above-mentioned exhaust gas purification device (20, 41, 51, 61, 71) has: an upstream cylinder (21, 42) connected to the above-mentioned exhaust pipe (8E); The downstream cylinder body (24, 43) that discharges the exhaust gas; it is arranged between the above-mentioned upstream cylinder body (21, 42) and the downstream cylinder body (24, 43), and a filter ( 28) filter cylinder (26); installed on the above-mentioned upstream cylinder (21, 42), the upstream side pressure conduit (32, 54, 64); installed on the above-mentioned downstream cylinder body (24, 43), the downstream side pressure conduit (33, 55, 65) that guides the pressure in the above-mentioned downstream cylinder body (24, 43) to the outside; and these conduits ( 32, 33, 54, 55, 64, 65) are connected and detect the pressure sensor (34, 56, 66) of the front and back pressure of the above-mentioned filter (28), The construction machine is characterized in that it adopts the following structure: The above-mentioned upstream cylinder body (21, 42) and the downstream cylinder body (24, 43) are fixedly arranged on the side of the above-mentioned vehicle body (2, 3), The above-mentioned filter cylinder (26) is configured to be able to be installed and disassembled relative to the above-mentioned upstream cylinder (21, 42) and downstream cylinder (24, 43), In order to carry out the maintenance work of the above-mentioned filter cylinder (26), the above-mentioned upstream side pressure conduits (32, 54, 64), downstream side pressure conduits (33, 55, 65) and pressure sensors (34, 56, 66) are equipped with Set at a position deviated from the moving route (30) after the above-mentioned filter cylinder (26) is disassembled from the above-mentioned upstream cylinder (21, 42) and downstream cylinder (24, 43) and route when moved to, or returned from, another location and installed, The vehicle body (2, 3) is provided with a partition member (16) that partitions the engine-side space (17) formed on the side of the above-mentioned engine (8) from the space formed on the side of the hydraulic pump (10). pump side space (18), so as to prevent the operating oil from scattering from the pump side space (18) to the engine side space (17), the exhaust gas purification device (20, 41, 51, 61, 71) is arranged in the partition member ( 16) In the partitioned engine side space (17), the above-mentioned moving route (30) for moving the above-mentioned filter cylinder (26) is formed between the above-mentioned partition member (16) and the engine (8), The above-mentioned partition member (16) is arranged in an elongated manner in the vertical direction, and the above-mentioned moving route (30) for moving the above-mentioned filter cartridge (26) is formed by the gap between the above-mentioned partition member (16) and the engine (8). Space formation in the up and down direction. 2. The construction machine according to claim 1, characterized in that, the following structure is adopted: The above-mentioned engine (8) is provided with a support member (19) for installing the above-mentioned exhaust gas purification device (20, 41, 71), and on this support member (19), the insertion space of the above-mentioned filter cartridge (26) is ensured ( The state of S) fixedly install the above-mentioned upstream cylinder body (21, 42) and the downstream cylinder body (24, 43), and the above-mentioned pressure sensor (34) is at a position deviated from the moving route (30) of the above-mentioned filter cylinder body (26) Installed on the above-mentioned support member (19). 3. The construction machine according to claim 1, characterized in that, the following structure is adopted: The pressure sensor (56, 66) is mounted on either one of the upstream cylinder (21) or the downstream cylinder (24) at a position deviated from the moving path (30) of the filter cylinder (26). 4. The construction machine according to claim 1, characterized in that, the following structure is adopted: The above-mentioned upstream side pressure conduits (32, 54, 64) and downstream side pressure conduits (33, 55, 65) are along the above-mentioned upstream cylinder body (21, 42), the filter cylinder (26), the outer peripheral side of the downstream cylinder (24, 43) is arranged. 5. The construction machine according to claim 1, characterized in that, the following structure is adopted: The partition member (16) consists of a bottom plate portion (16A) extending in a direction away from the engine (8) on the upper side of the hydraulic pump (10), and a direction away from the engine (8) from the bottom plate portion (16A). The end portion of the vertical plate portion (16B) extending upward is formed, On the other hand, a support member (19) for supporting the above-mentioned exhaust gas purification device (20, 41, 51, 61, 71) is provided on the above-mentioned engine (8), and the support member (19) consists of a The installation part (19A) and the purification device support part (19B) extending from the direction away from the engine (8) on the upper side of the bottom plate part (16A) of the partition member (16) from the installation part (19A) are formed, The above-mentioned exhaust gas purification device (20, 41, 51, 61, 71) is installed on the purification device support part (19B) of the above-mentioned support member (19), The moving path (30) is formed in the engine side space (17), that is, between the vertical plate portion (16B) of the partition member (16) and the engine (8), The above-mentioned pressure sensor (34) is installed on the above-mentioned support member (19), the upstream cylinder (21, 42), the downstream cylinder (24, 43) on any one of the . 6. The construction machine according to claim 1, characterized in that, the following structure is adopted: An installation frame (15) is provided on the vehicle body (2, 3) for arranging the above-mentioned partition member (16) above the above-mentioned hydraulic pump (10). The installation frame (15) maintains the above-mentioned partition from the surrounding A rectangular frame portion (15A) of the component (16) and a plurality of foot portions (15B) extending downward from the frame portion (15A) and mounted on the above-mentioned vehicle body (2, 3) are constituted, and the above-mentioned moving route (30 ) is the range surrounded by the frame portion (15A) of the above-mentioned mounting frame (15).

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